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Progress Report on TPC Field Cage Project: Schedule, Prototyping, and Contractual Matters

This report details the progress of the TPC Field Cage project managed by Thomas C. Meyer at EP-AIT, covering technical advancements, project scheduling, and contractual issues. Key findings include successful high-voltage stability tests under extreme conditions, innovative gas cooling techniques, and modifications in materials for enhanced compatibility and leak prevention. Additionally, it addresses procurement challenges, particularly related to cost overruns and adjustments in the scope of tenders. The report outlines expectations for catching up on the baseline schedule in 2002/3.

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Progress Report on TPC Field Cage Project: Schedule, Prototyping, and Contractual Matters

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  1. TPC Field Cage Progress Report • Project Schedule • Technical Progress & Prototyping • Contractual Matters Thomas C. Meyer/EP-AIT

  2. Field Cage: Project Schedule Thomas C. Meyer/EP-AIT

  3. Tests & Prototyping • HV • High ionization behavior (83Kr) • Temperature stabilization • Resistor chain cooling • Construction material • Compatibility and leaks • Electrical network • “From strip to central electrode” Thomas C. Meyer/EP-AIT

  4. High Voltage Stability • History: • Field cage was exposed to >16 x expected average charged particle intensityin CERES beam (~ 6000/cm2 s). • Field cage was operated at 1.78 x nominal drift field (~700 V/cm) in pure CO2. • Surface charge phenomena appearing at 60 kV (≥ 400 V/cm). • Insulation gap safe at ≥ 100 kV. Thomas C. Meyer/EP-AIT

  5. High Intensity 83Kr Test • Inject 83Kr with 300 MBq total intensity into field cage (May 2001) • Separate tests for drift and insulation volume. Thomas C. Meyer/EP-AIT

  6. Temperature Stability • History: • Require: DT everywhere ≤ 0.1 ºC • Resistor rod produces 60 W waste heat. • Liquid cooling (H2O) proven very efficient with negligible gradient inside rod but… • H2O unsuitable at HV (dissociation), • Inert liquids dangerous in case of leaks. • New approach: Gas cooling Thomas C. Meyer/EP-AIT

  7. Resistor Rod: Gas Cooling T [ºC] Ambient level z [m] 2.5 • Unlike liquid cooling, DT inside rod always > 0.1 ºC. • --> must insulate rod! • Foam for test • Double wall for ALICE. Thomas C. Meyer/EP-AIT

  8. Gas Cooling: Results Tin = 16 ºC 7 ºC • Inside of rod achieve Dtmin of 7 ºC with 20 m3/h of air: Thomas C. Meyer/EP-AIT

  9. Gas Cooling: Results • Outside of rod achieve required DT of ≤ 0.1 ºC within a few cm from rod: Numbers are given in units of 1/100 ºC; Blue numbers indicate zone around rod with DT < 0.1 ºC Thomas C. Meyer/EP-AIT

  10. Material tests Carbon Fiber DL/L [µm/m] Glass Fiber Kevlar Fiber Macrolon Drying T[ h] Wet Leak test of full-size end plate sector with “CERES” gasket Humidity tests of FC material Thomas C. Meyer/EP-AIT

  11. Voltage Divider: Central Electrode • Focus on “stretched foil” version • High modulus carbon-fiber frames NA48 Example Thomas C. Meyer/EP-AIT

  12. Voltage Divider: Rods & Strips • Ongoing prototyping of all rod types • Resistor rod • HV supply rod • Laser rod • Regular support rod • Verification of strip tension and mounting scheme • Vertical or horizontal? Thomas C. Meyer/EP-AIT

  13. Tooling • Modification of DELPHI support frame • Needed for construction & assembly of FC • Major handling tool for all operations • Finished by end of 2001 Thomas C. Meyer/EP-AIT

  14. Infrastructure: SXL2 • Preparation of dedicated clean area for TPC assembly in LHC interaction region 2: • Finished by December 2001 Clean zone in hall SXL2 Thomas C. Meyer/EP-AIT

  15. Contracting: FC Cylinders • First „Invitation to Tender“ (IT-2726) was launched on schedule in 2000, but... • all offers (4) were above funding level. • Changed scope of tender: • Only production of individual parts (panels & flanges) • Procurement by and assembly at CERN • New tender (IT-2999) sent April 2001 • 6 months delay in schedule Thomas C. Meyer/EP-AIT

  16. Contracting: End Plates • First „Price Inquiry“ was made in 2000. • Lowest bid exceeded funding by large factor. • Try to achieve savings by… • splitting production process (raw material, welding, machining), and • design changes. • New tenders to be launched this month • only if expected savings materialize! • Overall production delay ≥ 6 months. Thomas C. Meyer/EP-AIT

  17. Contracts: Consequences for CERN • Higher manpower load on CERN (TA2) • Higher risks in terms of… • technical failure, • quality control, liability, warrenty! • schedule slippage, • capital loss. • We expect to catch up on the baseline schedule during the internal assembly of the FC (2002/3). Thomas C. Meyer/EP-AIT

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